You can create a storage policy with deduplication and assign it to a storage pool with global deduplication to use the data paths and deduplication settings of a global deduplication policy.
You can create a storage policy by using the Create a Storage Policy wizard.
Alternatively, you can automate the creation of a storage policy associated with a global deduplication enabled storage pool by using the sp_creation.xml configuration file. For more information, see Creating a Global Deduplication Enabled Storage Policy.
Before You Begin
Before assigning a storage policy to a storage pool with global deduplication, observe the following limitations or restrictions:
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Assign the storage pool with global deduplication at the time of storage policy or copy creation. Once assigned, you can neither change nor disable the storage pool. 
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You cannot modify existing storage policy copies for global deduplication. 
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No two storage policy copies in a storage policy can be associated with the same storage pool. 
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You cannot associate client computers to the global deduplication policy. You can associate them only to the standard storage policy. 
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When you configure global deduplication for multiple storage policy copies, ensure that the MediaAgents of all copies have access to the deduplication database (DDB). 
Gather Storage Policy Data
| Required Information | Details | 
|---|---|
| Storage Policy Type | Data Protection and Archiving | 
| Storage Policy Name | Name of the storage policy. For example: SP_for_VMWareBackups. | 
| Storage Pool | Select a storage pool with global deduplication or without global deduplication. Name of the storage pool with global deduplication enabled that you want to associate this storage policy. | 
Procedure
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From the CommCell Browser, expand Policies. 
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Right-click Storage Policies, and then click New Storage Policy. The Create Storage Policy Wizard opens. Follow the instructions in the storage policy creation wizard. 
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Click Finish to create the storage policy. The new storage policy appears under the Storage Policies node.